Synthesis of Ni(OH)<sub>2</sub>/RGO pseudocomposite on nickel foam for supercapacitors with superior performance

Min, Shudi; Zhao, Chongjun; Zhang, Zhuomin; Chen, Guorong; Qian, Xiuzhen; Guo, Zaiping

doi:10.1039/c4ta06233g

Cited by 153 publications

(77 citation statements)

References 57 publications

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“…1(d) shows the high-resolution Ni 2p 3/2 and Ni 2p 1/2 peaks centered at 855.7 and 873.6 eV, respectively, with a spin-energy separation of 17.9 eV, which is in good agreement with the reported data for Ni 2+ . 36 In Fig. 1(e), the Co 2p XPS spectrum of the sample exhibits two peaks, at 781.3 and 796.8 eV, corresponding to the characteristic Co 2p 3/2 and Co 2p 1/2 peaks, with a spin-energy separation of 15.7 eV, demonstrating the presence of Co 2+ .…”

Section: Resultsmentioning

confidence: 93%

Co-doped Ni hydroxide and oxide nanosheet networks: laser-assisted synthesis, effective doping, and ultrahigh pseudocapacitor performance

Liang

et al. 2016

J. Mater. Chem. A

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Morphology control and impurity doping are two widely applied strategies to improve the electrochemical performance of nanomaterials. Herein, we report an environmentally friendly approach to obtain Co-doped Ni(OH) 2 nanosheet networks using a laser-induced cobalt colloid as a doping precursor followed by an aging treatment in a hybrid medium of nickel ions. The shape and specific surface area of the doped Ni(OH) 2 can be successfully adjusted by changing the concentration of sodium thiosulfate. Furthermore, a Co-doped Ni(OH) 2 nanosheet network was further converted into Co-doped NiO with its pristine morphology retained via facile thermal decomposition in air. The structure and electrochemical performance of the as-prepared samples are investigated with scanning and transmission electron microscopy, energy dispersive X-ray analysis, X-ray diffraction, Fourier transform infrared spectroscopy, the nitrogen adsorption-desorption isotherm technique, and electrochemical measurements. The Codoped Ni(OH) 2 electrode shows an ultrahigh specific capacitance of 1421 F g À1 at a current density of 6 A g À1 , and a good retention level of 76% after 1000 cycles, in sharp contrast with only a 47% retention level of the pure Ni(OH) 2 electrode at the same current density. In addition, the Co-doped NiO electrode exhibits a capacitance of 720 F g À1 at 6 A g À1 and 92% retention after 1000 cycles, which is also superior to the corresponding values of relevant pure NiO electrodes. The Co 2+ partially substitutes for Ni 2+ in the metal hydroxide and oxide, resulting in an increase of free holes in the valence band, and, therefore, enhancement of the p-type conductivity of Ni(OH) 2 and NiO. Moreover, such novel mesoporous nanosheet network structures are also able to enlarge the electrode-electrolyte contact area and shorten the path length for ion transport. The synergetic effect of these two results is responsible for the observed ultrahigh pseudocapacitor performance.

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Section: Resultsmentioning

confidence: 93%

Co-doped Ni hydroxide and oxide nanosheet networks: laser-assisted synthesis, effective doping, and ultrahigh pseudocapacitor performance

Liang

et al. 2016

J. Mater. Chem. A

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“…In this current paper, 80 scientific papers describing new Ni(OH) 2 or NiO-based electrodes for supercapacitor [12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32,33,34,35,36,37,38,39,40,41,42,43,44,45,46,47,48,49,50,51,52,53,54,55,56,57,58,59,60,61,62,63,64,65,66,67,68,69,70,71,72,73,74,75,76,77,78,…”

Section: Methodsmentioning

confidence: 99%

Ni(OH)2 and NiO Based Composites: Battery Type Electrode Materials for Hybrid Supercapacitor Devices

et al. 2018

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Nanocomposites of Ni(OH)2 or NiO have successfully been used in electrodes in the last five years, but they have been falsely presented as pseudocapacitive electrodes for electrochemical capacitors and hybrid devices. Indeed, these nickel oxide or hydroxide electrodes are pure battery-type electrodes which store charges through faradaic processes as can be shown by cyclic voltammograms or constant current galvanostatic charge/discharge plots. Despite this misunderstanding, such electrodes can be of interest as positive electrodes in hybrid supercapacitors operating under KOH electrolyte, together with an activated carbon-negative electrode. This study indicates the requirements for the implementation of Ni(OH)2-based electrodes in hybrid designs and the improvements that are necessary in order to increase the energy and power densities of such devices. Mass loading is the key parameter which must be above 10 mg·cm−2 to correctly evaluate the performance of Ni(OH)2 or NiO-based nanocomposite electrodes and provide gravimetric capacity values. With such loadings, rate capability, capacity, cycling ability, energy and power densities can be accurately evaluated. Among the 80 papers analyzed in this study, there are indications that such nanocomposite electrode can successfully improve the performance of standard Ni(OH)2 (+)//6 M KOH//activated carbon (−) hybrid supercapacitor.

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“…An effective way of overcoming this problem is to build three-dimensional hierarchical nanoarchitectures or make hybrid nanocomposites [4,14,[19][20][21].…”

Section: Introductionmentioning

confidence: 99%

In suit growth of ultradispersed NiCo2S4 nanoparticles on graphene for asymmetric supercapacitors

Xiao

Wang

et al. 2015

Electrochimica Acta

100

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Synthesis of Ni(OH)₂/RGO pseudocomposite on nickel foam for supercapacitors with superior performance

Cited by 153 publications

References 57 publications

Co-doped Ni hydroxide and oxide nanosheet networks: laser-assisted synthesis, effective doping, and ultrahigh pseudocapacitor performance

Co-doped Ni hydroxide and oxide nanosheet networks: laser-assisted synthesis, effective doping, and ultrahigh pseudocapacitor performance

Ni(OH)2 and NiO Based Composites: Battery Type Electrode Materials for Hybrid Supercapacitor Devices

In suit growth of ultradispersed NiCo2S4 nanoparticles on graphene for asymmetric supercapacitors

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Synthesis of Ni(OH)2/RGO pseudocomposite on nickel foam for supercapacitors with superior performance

Cited by 153 publications

References 57 publications

Co-doped Ni hydroxide and oxide nanosheet networks: laser-assisted synthesis, effective doping, and ultrahigh pseudocapacitor performance

Co-doped Ni hydroxide and oxide nanosheet networks: laser-assisted synthesis, effective doping, and ultrahigh pseudocapacitor performance

Ni(OH)2 and NiO Based Composites: Battery Type Electrode Materials for Hybrid Supercapacitor Devices

In suit growth of ultradispersed NiCo2S4 nanoparticles on graphene for asymmetric supercapacitors

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Synthesis of Ni(OH)₂/RGO pseudocomposite on nickel foam for supercapacitors with superior performance